Top Definition
A devoted stepmother via marriage or long-term relationship who has become the target for most family disputes that happened before she even came along.
"I don't know about yours, but I hate mine."

"Mine's great. Everybody kinda made her a Stepmartyr, but she's still here."
by Sister Marie, Pigtailed Pirate August 06, 2008
5 Words related to Stepmartyr

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